* {
  margin: 0;
  padding: 0;
}
li {
  list-style: none;
}
main {
  margin: 50px auto;
  width: 960px;
  height: 500px;
}
main h4 {
  height: 100px;
  line-height: 100px;
  text-align: center;
}
main .tabBox {
  margin: 0 auto;
  width: 900px;
  height: 400px;
  border: 1px solid lightsalmon;
}
main input {
  width: 80%;
  height: 80%;
  border: 2px solid #000;
}
nav {
  overflow: hidden;
}
nav li {
  position: relative;
  float: left;
  width: 100px;
  height: 50px;
  text-align: center;
  line-height: 50px;
  border-right: 1px solid #ccc;
}
nav li .icon-guanbi {
  position: absolute;
  top: -20px;
  right: 0;
  font-size: 12px;
  height: 20px;
  user-select: none;
}
nav .liActive {
  border-bottom: 1px solid red;
}
nav .tabAdd span {
  float: right;
  margin: 10px;
  width: 20px;
  height: 20px;
  line-height: 20px;
  text-align: center;
  border: 1px solid #ccc;
  user-select: none;
}
.tabContent {
  height: 350px;
  padding: 30px;
  box-sizing: border-box;
  border-top: 1px solid #ccc;
}
.tabContent section {
  display: none;
  width: 100%;
  height: 240px;
}
.tabContent .sectionActive {
  display: block;
}
